Guide
How to Collect W-9 and COI Together
By Keelstar Team · Updated July 11, 2026
The short answer
Request W-9 and COI in the same portal invitation with tier-appropriate insurance requirements attached. Explain both needs upfront: tax reporting and risk transfer are separate gates but equally block payment. Provide COI requirement summary (limits, additional insured, waiver) alongside W-9 instructions to prevent back-and-forth. Validate in parallel — AP on TIN, risk on coverage. Do not mark vendor approved until both pass unless a documented exception applies. Annual refresh campaigns should bundle W-9 and COI renewal for vendors needing both, timed before COI expiration and 1099 season.
Single invitation, dual requirements
Portal task list shows W-9 and COI with equal visibility. Sequencing invites imply one is optional — vendors delay the 'secondary' item indefinitely.
Attach requirement specs
Link insurance requirement PDF or in-portal limits table when requesting COI. Vendors submit wrong limits when requirements live only in buyer's head.
Parallel validation workflow
Route submissions to AP and risk simultaneously. First approver done should not flip vendor to approved — wait for all required gates.
Renewal coordination
COI expires on rolling dates; W-9 refreshes on policy schedule. Bundle vendors due for both in one campaign where timelines align.
Exception policy clarity
If COI follows W-9 for low-risk categories, document categories explicitly in tier matrix — not ad-hoc buyer discretion.
Frequently asked questions
- Should W-9 or COI be collected first?
- Request simultaneously. AP often prioritizes W-9 validation; risk prioritizes COI. Parallel collection cuts total cycle time.
- What if the vendor sends COI but not W-9?
- Keep status blocked for payment. Partial completion should show both outstanding items clearly in portal.
- Do all vendors need both?
- Most U.S. service and contractor vendors need both. Product-only resellers may need W-9 without COI if no on-site or professional liability exposure — tier accordingly.
- Can one email request both documents?
- Yes — one email with portal link listing both requirements beats separate threads that vendors answer at different times.
Related guides
Put this into a monitored workflow
Vendor Packet handles this continuously — with reminders and an audit trail.